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arxiv_abstracts_gfissore | 1,994 | Symplectic Computation of Lyapunov Exponents
A recently developed method for the calculation of Lyapunov exponents of
dynamical systems is described. The method is applicable whenever the
linearized dynamics is Hamiltonian. By utilizing the exponential representation
of symplectic matrices, this approach avoids the re... | 127 | academic |
arxiv_abstracts_gfissore | 1,994 | Order Corrections to the Classical Dynamics of a Particle with
Intrinsic Spin Moving in a Constant Magnetic Field
O() effects that modify the classical orbit of a charged particle are
described for the case of a classical spin-1/2 particle moving in a constant
magnetic field, using a manifestly covariant formalism r... | 167 | academic |
arxiv_abstracts_gfissore | 1,994 | Candela Photo-Injector Experimental Results
The CANDELA photo-injector is a two cell S-band photo-injector. The copper
cathode is illuminated by a 500 fs Ti:sapphire laser. This paper presents
energy spectrum measurements of the dark current and intense electron emission
that occurs when the laser power density is ver... | 73 | academic |
arxiv_abstracts_gfissore | 1,994 | High-Brightness Photocathode Electron Sources
Most present and future electron accelerators require bright sources.
Invented less than ten years ago, the photo-injector the principle of which is
briefly recalled, has already demonstrated that it can provide very bright
beams. In this paper, the most advanced photo-inj... | 138 | academic |
arxiv_abstracts_gfissore | 1,995 | Finding matched rms envelopes in rf linacs: A Hamiltonian approach
We present a new method for obtaining matched solutions of the rms envelope
equations. In this approach, the envelope equations are first expressed in
Hamiltonian form. The Hamiltonian defines a nonlinear mapping, M , and
for periodic transport systems... | 226 | academic |
arxiv_abstracts_gfissore | 1,995 | Coupling Impedances and Heating due to Slots in the KEK B-factory
The longitudinal and transverse coupling impedances produced by the long
slots in the Low Energy Ring of KEK B-factory are calculated. The power
dissipated inside the vacuum chamber due to the fields scattered by the slots
is evaluated using results for... | 94 | academic |
arxiv_abstracts_gfissore | 1,995 | A Study of Influence of Synchrotron Radiation Quantum Fluctuations on
the Synchrotron Oscillations of a Single Electron Using Undulator Radiation
A single electron circulating in a storage ring is a very peculiar object.
Synchrotron radiation quantum fluctuation causes stohastic process in the
synchrotron oscillation... | 114 | academic |
arxiv_abstracts_gfissore | 1,995 | Beam Dynamics problems in a muon collider
We discuss the various beam dynamics problems in muon collider systems,
starting from the proton accelerator needed to generate the muon beams and
proceeding through the muon storage ring. | 46 | academic |
arxiv_abstracts_gfissore | 1,995 | Muon Transverse Ionization Cooling: Stochastic Approach
Transverse ionization cooling of muons is modeled as a Brownian motion of the
muon beam as it traverses a Li or Be rod. A Langevin like equation is written
for the free particle case (no external transverse magnetic field) and for the
case of a harmonically bound... | 122 | academic |
arxiv_abstracts_gfissore | 1,995 | MONTE CARLO SIMULATIONS OF MUON PRODUCTION
Muon production requirements for a muon collider are presented. Production of
muons from pion decay is studied. Lithium lenses and solenoids are considered
for focussing pions from a target, and for matching the pions into a decay
channel. Pion decay channels of alternating q... | 119 | academic |
arxiv_abstracts_gfissore | 1,995 | A General Approach for Calculating Coupling Impedances of Small
Discontinuities
A general theory of the beam interaction with small discontinuities of the
vacuum chamber is developed taking into account the reaction of radiated waves
back on the discontinuity. The reactive impedance calculated earlier is
reproduced a... | 124 | academic |
arxiv_abstracts_gfissore | 1,995 | Trapped Modes in the Vacuum Chamber of an Arbitrary Cross Section
It has been shown that a small discontinuity such as an enlargement or a hole
on circular waveguides can produce trapped electromagnetic modes with
frequencies slightly below the waveguide cutoff. The trapped modes due to
multiple discontinuities can le... | 171 | academic |
arxiv_abstracts_gfissore | 1,995 | Polarizabilities of an Annular Cut and Coupling Impedances of
Button-Type Beam Position Monitors
The longitudinal and transverse coupling impedances of a small discontinuity
on the accelerator chamber wall can be expressed in terms of the electric and
magnetic polarizabilities of the discontinuity. The polarizabiliti... | 161 | academic |
arxiv_abstracts_gfissore | 1,995 | RFQ-DRL MATCHING SOLUTIONS FOR DIFFERENT REQUIREMENTS
The Radio-Frequency Quadrupole (RFQ) has a FODO lattice and Drift-Tube-Linacs
(DTL) in general also have FODO lattices. Therefore the natural solution for
the matching between these is a FODO lattice. For matching in all three planes
one then needs sixteen degrees ... | 166 | academic |
arxiv_abstracts_gfissore | 1,995 | Stroboscopic Laser Diagnostics for Detection of Ordering in
One-Dimensional Ion beam
A novel diagnostic method for detecting ordering in one-dimensional ion beams
is presented. The ions are excited by a pulsed laser at two different positions
along the beam and fluorescence is observed by a group of four
photomultipl... | 84 | academic |
arxiv_abstracts_gfissore | 1,995 | Normal Mode Tunes for Linear Coupled Motion in Six Dimensional Phase
Space
The motion of a particle in 6-dimensional phase space in the presence of
linear coupling can be written as the sum of 3 normal modes. A cubic equation
is found for the tune of the normal modes, which allows the normal mode tunes
to be computed... | 199 | academic |
arxiv_abstracts_gfissore | 1,995 | Coaxial Ring Cyclotron as a Perspective Nuclear Power Engineering
Machine
The circuit arrangement of the proposed coaxial ring cyclotron (CRC) is
described, and its main advantages, such as simple injection technique, several
injected beams summation option, high efficiency, are considered. The proposed
proton accele... | 152 | academic |
arxiv_abstracts_gfissore | 1,995 | Linear Orbit Parameters for the Exact Equations of Motion
This paper defines the beta function and other linear orbit parameters using
the exact equations of motion. The orbit functions are redefined using the
exact equations. Expressions are found for the transfer matrix and the
emittances. Differential equations are... | 81 | academic |
arxiv_abstracts_gfissore | 1,995 | Ultrashort Laser-pulse Diagnostics for Detection of Ordering within an
Ion beam
A novel diagnostic method to detect ordering within one-dimensional ion beams
in a storage ring is presented. The ions are simultaneously excited by a
ultrashort pulsed laser ( 1 ps) at two different locations along the
beam and fluoresce... | 98 | academic |
arxiv_abstracts_gfissore | 1,995 | Polarizabilities of an Annular Cut in the Wall of an Arbitrary Thickness
The electric and magnetic polarizabilities of an aperture are its important
characteristics in the theory of aperture coupling and diffraction of EM waves.
The beam coupling impedances due to a small discontinuity on the chamber wall
of an accele... | 197 | academic |
arxiv_abstracts_gfissore | 1,995 | Full Phase-Space Analysis of Particle Beam Transport in the Thermal Wave
Model
Within the Thermal Wave Model framework a comparison among Wigner function,
Husimi function, and the phase-space distribution given by a particle tracking
code is made for a particle beam travelling through a linear lens with small
aberrat... | 80 | academic |
arxiv_abstracts_gfissore | 1,995 | Radiation Damping and Quantum Excitation for Longitudinal Charged
Particle Dynamics in the Thermal Wave Model
On the basis of the recently proposed Thermal Wave Model (TWM) for
particle beams, we give a description of the longitudinal charge particle
dynamics in circular accelerating machines by taking into account b... | 212 | academic |
arxiv_abstracts_gfissore | 1,995 | Construction of Nonlinear Symplectic Six-Dimensional Thin-Lens Maps by
Exponentiation
The aim of this paper is to construct six-dimensional symplectic thin-lens
transport maps for the tracking program SIXTRACK, continuing an earlier report
by using another method which consistes in applying Lie series and
exponentiat... | 154 | academic |
arxiv_abstracts_gfissore | 1,995 | Linear Parameters and the Decoupling Matrix for Linearly Coupled Motion
in 6 Dimensional Phase Space
It will be shown that starting from a coordinate system where the 6 phase
space coordinates are linearly coupled, one can go to a new coordinate system
where the motion is uncoupled by means of a linear transformation... | 305 | academic |
arxiv_abstracts_gfissore | 1,995 | Particle Motion in the Stable Region Near an Edge of a Linear
Half-Integer Stopband
This paper studies the motion of a particle whose tune is inside and near a
linear half-integer stopband. Results are found for the tune and beta functions
in the stable region close to an edge of the stopband. It is shown that the
ei... | 111 | academic |
arxiv_abstracts_gfissore | 1,996 | Particle Motion in the Stable Region Near an Edge of a Linear Sum
Resonance Stopband
This paper studies the particle motion when the tune is in the stable region
close to the edge of linear sum resonance stopband. Results are found for the
tune and the beta functions. Results are also found for the two solutions of
t... | 99 | academic |
arxiv_abstracts_gfissore | 1,996 | Muon Colliders
Muon Colliders have unique technical and physics advantages and disadvantages
when compared with both hadron and electron machines. They should thus be
regarded as complementary. Parameters are given of 4 TeV and 0.5 TeV high
luminosity colliders, and of a 0.5 TeV lower luminosity demonstration
machine.... | 125 | academic |
arxiv_abstracts_gfissore | 1,996 | Diffusion due to the Beam-Beam Interaction and Fluctuating Fields in
Hadron Colliders
Random fluctuations in the tune, beam offsets and beam size in the presence
of the beam-beam interaction are shown to lead to significant particle
diffusion and emittance growth in hadron colliders. We find that far from
resonances ... | 120 | academic |
arxiv_abstracts_gfissore | 1,996 | Final Focus System for a Muon Collider: A Test Model
The present scenario for a high luminosity 4 TeV on center of mass muon
collider requires a beta function =3 mm at the interaction point. We discuss a
test model of a basic layout which satisfies the requirements although it is
not fully realistic. | 68 | academic |
arxiv_abstracts_gfissore | 1,996 | On the Problem of the Coupled Cavity Chain Characteristic Calculations
This paper presents the results of studies in elaboration of a mathematical
model of the cavity-chain slow wave structures. Considered is the problem of
coupling of an infinitely long cylindrical cavity chain coupled through
centerholes in the divi... | 232 | academic |
arxiv_abstracts_gfissore | 1,996 | On Two-cavity Coupling
This work presents research results on a novel analytical model of
electromagnetic systems coupling through small size holes. The key problem
regarding coupling of two cavities through an aperture in separating screen of
finite thickness without making assumption on smallness of any parameters i... | 126 | academic |
arxiv_abstracts_gfissore | 1,996 | Analytical Solutions in the Two-cavity Coupling Problem
Analytical solution of precise equations that describe the rf-coupling of two
cavities through a co-axial cylindrical hole are given for various limited
cases. For their derivation we have used the method of solution of an infinite
set of linear algebraic equatio... | 78 | academic |
arxiv_abstracts_gfissore | 1,996 | Muon Collider Design
Muon Colliders have unique technical and physics advantages and disadvantages
when compared with both hadron and electron machines. They should thus be
regarded as complementary. Parameters are given of 4 TeV and 0.5 TeV high
luminosity ^+ ^- colliders, and of a 0.5 TeV lower luminosity
demonstrat... | 137 | academic |
arxiv_abstracts_gfissore | 1,996 | Approximate Analytical Description of the Underdense Short Plasma Lens
The perturbative approach for describing the underdense
plasma--ultrarelativistic electron bunch system is developed, using the ratio
(n_0)/(n_b) as a small parameter ( n_b --bunch, n_0 --plasma electron
densities). Focusing of the electron bunch ... | 129 | academic |
arxiv_abstracts_gfissore | 1,996 | A tracking algorithm for the stable spin polarization field in storage
rings using stroboscopic averaging
Polarized protons have never been accelerated to more than about 25 GeV. To
achieve polarized proton beams in RHIC (250GeV), HERA (820GeV), and the
TEVATRON (900GeV), ideas and techniques new to accelerator physi... | 272 | academic |
arxiv_abstracts_gfissore | 1,996 | Orbit Dynamics for Unstable Linear Motion
A treatment is given of the orbit dynamics for linear unstable motion that
allows for the zeros in the beta function and makes no assumptions about the
realness of the betatron and phase functions. The phase shift per turn is shown
to be related to the beta function and the nu... | 95 | academic |
arxiv_abstracts_gfissore | 1,996 | An Investigation of Stochastic Cooling in the Framework of Control
Theory
This report provides a description of unbunched beam stochastic cooling in
the framework of control theory. The main interest in the investigation is
concentrated on the beam stability in an active cooling system. A stochastic
cooling system mu... | 264 | academic |
arxiv_abstracts_gfissore | 1,996 | A Scintillating Fiber Hodoscope for a Bremstrahlung Luminosity Monitor
at an Electron - Positron Collider
The performance of a scintillating fiber (2mm diameter) position sensitive
detector ( 4.8 4.8 cm ^2 active area) for the single bremstrahlung
luminosity monitor at the VEPP-2M electron-positron collider in Novosi... | 220 | academic |
arxiv_abstracts_gfissore | 1,996 | Calculation of the dynamic aperture in the ANKA storage ring with a
high-field wavelength shifter
Third order tracking calculations show that a wavelength shifter on the basis
of a commercially available 12 T split-pair solenoid is compatible with the
ANKA storage ring | 57 | academic |
arxiv_abstracts_gfissore | 1,996 | Selfacceleration of Electrons in One-dimensional Bunches, Moving in Cold
Plasma
Nonlinear dynamics of the one-dimensional ultrarelativistic bunch of
electrons,moving in cold plasma,is considered in multiple scales perturbative
approach. A square root of the inverse Lorentz factor of the bunch electrons is
taken as a ... | 115 | academic |
arxiv_abstracts_gfissore | 1,996 | A High Current Proton Linac with 352 MHz SC Cavities
A proposal for a 10-120 mA proton linac employing superconducting
beta-graded, CERN type, four cell cavities at 352 MHz is presented. The high
energy part (100 MeV-1 GeV) of the machine is split in three beta-graded
sections, and transverse focusing is provided via ... | 295 | academic |
arxiv_abstracts_gfissore | 1,996 | Coupling Impedances of Azimuthally Symmetric Obstacles of
Semi-Elliptical Shape in a Beam Pipe
The beam coupling impedances of small axisymmetric obstacles having a
semi-elliptical cross section along the beam in the vacuum chamber of an
accelerator are calculated at frequencies for which the wavelength is large
comp... | 110 | academic |
arxiv_abstracts_gfissore | 1,996 | Beam Coupling Impedances of Obstacles Protruding into Beam Pipe
The beam coupling impedances of small obstacles protruding inside the vacuum
chamber of an accelerator are calculated analytically at frequencies for which
the wavelength is large compared to a typical size of the obstacle. Simple
formulas for a few impor... | 127 | academic |
arxiv_abstracts_gfissore | 1,993 | The length of a typical Huffman codeword
If p is the probability of a letter of a memoryless source, the length l of
the corresponding binary Huffman codeword can be very different from the value
-log p. We show that, nevertheless, for a typical letter, l is approximately
equal to -log p. More precisely, the probabili... | 90 | academic |
arxiv_abstracts_gfissore | 1,993 | Evolution to the Edge of Chaos in Imitation Game
Motivated by the evolution of complex bird songs, an abstract imitation game
is proposed to study the increase of dynamical complexity: Artificial "birds"
display a "song" time series to each other, and those that imitate the other's
song better win the game. With the i... | 136 | academic |
arxiv_abstracts_gfissore | 1,993 | Revisiting the Edge of Chaos: Evolving Cellular Automata to Perform
Computations
We present results from an experiment similar to one performed by Packard
(1988), in which a genetic algorithm is used to evolve cellular automata (CA)
to perform a particular computational task. Packard examined the frequency of
evolved... | 284 | academic |
arxiv_abstracts_gfissore | 1,993 | Antichaos in a Class of Random Boolean Cellular Automata
A variant of Kauffman's model of cellular metabolism is presented. It is a
randomly generated network of boolean gates, identical to Kauffman's except for
a small bias in favor of boolean gates that depend on at most one input. The
bias is asymptotic to 0 as the... | 171 | academic |
arxiv_abstracts_gfissore | 1,993 | A Criterion for Stability in Random Boolean Cellular Automata
Random boolean cellular automata are investigated, where each gate has two
randomly chosen inputs and is randomly assigned a boolean function of its
inputs. The effect of non-uniform distributions on the choice of the boolean
functions is considered. The ma... | 118 | academic |
arxiv_abstracts_gfissore | 1,993 | Biased Random-Walk Learning: A Neurobiological Correlate to
Trial-and-Error
Neural network models offer a theoretical testbed for the study of learning
at the cellular level. The only experimentally verified learning rule, Hebb's
rule, is extremely limited in its ability to train networks to perform complex
tasks. An... | 220 | academic |
arxiv_abstracts_gfissore | 1,993 | A nonequilibrium statistical field theory of swarms and other spatially
extended complex systems
A class of models with applications to swarm behavior as well as many other
types of spatially extended complex biological and physical systems is studied.
Internal fluctuations can play an active role in the organization... | 146 | academic |
arxiv_abstracts_gfissore | 1,993 | Swarms, Phase Transitions, and Collective Intelligence
A spacially extended model of the collective behavior of a large number of
locally acting organisms is proposed in which organisms move probabilistically
between local cells in space, but with weights dependent on local morphogenetic
substances, or morphogens. The... | 280 | academic |
arxiv_abstracts_gfissore | 1,993 | Dynamics, Computation, and the "Edge of Chaos": A Re-Examination
In this paper we review previous work and present new work concerning the
relationship between dynamical systems theory and computation. In particular,
we review work by Langton and Packard on the
relationship between dynamical behavior and computational... | 189 | academic |
arxiv_abstracts_gfissore | 1,993 | Exact solutions for a mean-field Abelian sandpile
We introduce a model for a sandpile, with N sites, critical height N and each
site connected to every other site. It is thus a mean-field model in the
spin-glass sense. We find an exact solution for the steady state probability
distribution of avalanche sizes, and disc... | 77 | academic |
arxiv_abstracts_gfissore | 1,993 | Prediction and Adaptation in an Evolving Chaotic Environment
We describe the results of analytic calculations and computer simulations of
adaptive predictors (predictive agents) responding to an evolving chaotic
environment and to one another. Our simulations are designed to quantify
adaptation and to explore co-adapt... | 270 | academic |
arxiv_abstracts_gfissore | 1,993 | Dynamics of Earthquake Faults
We present an overview of our ongoing studies of the rich dynamical behavior
of the uniform, deterministic Burridge--Knopoff model of an earthquake fault.
We discuss the behavior of the model in the context of current questions in
seismology. Some of the topics considered include: (1) bas... | 167 | academic |
arxiv_abstracts_gfissore | 1,993 | On the Threshold of Chaos in Random Boolean Cellular Automata
A random boolean cellular automaton is a network of boolean gates where the
inputs, the boolean function, and the initial state of each gate are chosen
randomly. In this article, each gate has two inputs. Let a (respectively c )
be the probability the the g... | 234 | academic |
arxiv_abstracts_gfissore | 1,993 | Cell Division, Differentiation and Dynamic Clustering
A novel mechanism for cell differentiation is proposed, based on the dynamic
clustering in a globally coupled chaotic system. A simple model with metabolic
reaction, active transport of chemicals from media, and cell division is found
to show three successive stage... | 182 | academic |
arxiv_abstracts_gfissore | 1,993 | Imitation Games
Mutual imitation games among artificial birds are studied. By employing a
variety of mappings and game rules, the evolution to the edge between chaos and
windows is universally confirmed. Some other general features are observed,
including punctuated equilibria, and successive alternations of dominant
... | 84 | academic |
arxiv_abstracts_gfissore | 1,993 | Chaos as a Source of Complexity and Diversity in Evolution
The relevance of chaos to evolution is discussed in the context of the origin
and maintenance of diversity and complexity. Evolution to the edge of chaos is
demonstrated in an imitation game. As an origin of diversity, dynamic
clustering of identical chaotic e... | 216 | academic |
arxiv_abstracts_gfissore | 1,993 | Scaling behaviour in daily air humidity fluctuations
We show that the daily average air humidity fluctuations exhibit non-trivial
1/f^ behaviour which different from the spectral properties of other
meteorological quantities. This feature and the fractal spatial strucure found
in clouds make it plausible to regard ai... | 96 | academic |
arxiv_abstracts_gfissore | 1,993 | Parametric ordering of complex systems
Cellular automata (CA) dynamics are ordered in terms of two global
parameters, computable a priori from the description of rules. While one
of them (activity) has been used before, the second one is new; it estimates
the average sensitivity of rules to small configurational chang... | 119 | academic |
arxiv_abstracts_gfissore | 1,993 | Soft Turbulence in the Atmospheric Boundary Layer
In this work we compare the spectral properties of the daily medium
temperature fluctuations with the experimental results of the Chicago Group, in
which the local temperature fluctuations were measured in a helium cell. The
results suggest that the dynamics of the dai... | 86 | academic |
arxiv_abstracts_gfissore | 1,994 | Self-organized Criticality in Living Systems
We suggest that ensembles of self-replicating entities such as biological
systems naturally evolve into a self-organized critical state in which
fluctuations, as well as waiting-times between phase transitions are
distributed according to a 1/f power law. We demonstrate the... | 95 | academic |
arxiv_abstracts_gfissore | 1,994 | Learning and Complexity in Genetic Auto-Adaptive Systems
We describe and investigate the learning capablities displayed by a
population of self-replicating segments of computer-code subject to random
mutation: the tierra environment. We find that learning is achieved through
phase transitions that adapt the population... | 95 | academic |
arxiv_abstracts_gfissore | 1,994 | Training and Turnover in Organizations
We present a two-level model of organizational training and agent production.
Managers decide whether or not to train based on both the costs of training
compared to the benefits and on their expectations and observations of the
number of other firms that also train. Managers als... | 271 | academic |
arxiv_abstracts_gfissore | 1,994 | Like Sparrows on a Clothes Line: The Self-Organization of Random Number
Sequences
We study sequences of random numbers Z[1],Z[2],Z[3],...,Z[n] -- which can
be considered random walks with reflecting barriers -- and define their "types"
according to whether Z[i] > Z[i+1], (a down-movement), or Z[i] < Z[i+1]
(up-moveme... | 194 | academic |
arxiv_abstracts_gfissore | 1,994 | Cellular Games
A cellular game is a dynamical system in which cells, placed in some discrete
structure, are regarded as playing a game with their immediate neighbors.
Individual strategies may be either deterministic or stochastic. Strategy
success is measured according to some universal and unchanging criterion.
Succ... | 261 | academic |
arxiv_abstracts_gfissore | 1,994 | Beliefs and Cooperation
Individuals in groups must often choose between acting selfishly and
cooperating for the common good. The choices they make are based on their
beliefs on how they expect their actions to affect others. We show that for a
broad set of beliefs and group characteristics cooperation can appear
spon... | 122 | academic |
arxiv_abstracts_gfissore | 1,994 | On Modelling Life
We present a theoretical as well as experimental investigation of a
population of self-replicating segments of code subject to random mutation and
survival of the fittest. Under the assumption that such a system constitutes a
minimal system with characteristics of life, we obtain a number of statemen... | 80 | academic |
arxiv_abstracts_gfissore | 1,994 | Evolutionary Learning in the 2D Artificial Life System "Avida"
We present a new tierra-inspired artificial life system with local
interactions and two-dimensional geometry, based on an update mechanism akin to
that of 2D cellular automata. We find that the spatial geometry is conducive to
the development of diversity ... | 111 | academic |
arxiv_abstracts_gfissore | 1,994 | Nonlinear Dynamics in Distributed Systems
We build on a previous statistical model for distributed systems and
formulate it in a way that the deterministic and stochastic processes within
the system are clearly separable. We show how internal fluctuations can be
analysed in a systematic way using Van Kanpen's expansio... | 106 | academic |
arxiv_abstracts_gfissore | 1,994 | Study of a New Neuron
We study a modular neuron alternative to the McCulloch-Pitts neuron that
arises naturally in analog devices in which the neuron inputs are represented
as coherent oscillatory wave signals. Although the modular neuron can compute
XOR at the one neuron level, it is still characterized by the same
... | 136 | academic |
arxiv_abstracts_gfissore | 1,994 | Constructive Complexity and Artificial Reality: An Introduction
Basic problems of complex systems are outlined with an emphasis on
irreducibility and dynamic many-to-many correspondences. We discuss the
importance of a constructive approach to artificial reality and the
significance of an internal observer. | 57 | academic |
arxiv_abstracts_gfissore | 1,994 | Dynamics of a stochastically driven running sandpile
We analyze in detail a one-dimensional stochastically driven running
sandpile. The dynamics shows three different phases, depending on the on-site
relaxation rate and stochastic driving rate. Two phases are characterized by
the presence of travelling waves. The thir... | 69 | academic |
arxiv_abstracts_gfissore | 1,994 | Asymptotic Exit Location Distributions in the Stochastic Exit Problem
Consider a two-dimensional continuous-time dynamical system, with an
attracting fixed point S . If the deterministic dynamics are perturbed by
white noise (random perturbations) of strength , the system state
will eventually leave the domain of attr... | 364 | academic |
arxiv_abstracts_gfissore | 1,994 | A Network of Oscillators for Retrieving Phase Information
We propose a network of oscillators to retrieve given patterns in which the
oscillators keep a fixed phase relationship with one another. In this
description, the phase and the amplitude of the oscillators can be regarded as
the timing and the strength of the n... | 143 | academic |
arxiv_abstracts_gfissore | 1,994 | Bubbles and Market Crashes
We present a dynamical theory of asset price bubbles that exhibits the
appearance of bubbles and their subsequent crashes. We show that when
speculative trends dominate over fundamental beliefs, bubbles form, leading to
the growth of asset prices away from their fundamental value. This growt... | 100 | academic |
arxiv_abstracts_gfissore | 1,994 | Secondary Image Synthesis In Electronic Computer Photography (Vtorichnyj
Sintez Izobrazhenij V Elektronnoj Komp'Yuternoj Fotografii)
The principal scheme of the secondary image synthesis in electronic computer
photography is described. The crucial role of the Clebsch-Gordan coefficient
calculus is pointed out. | 75 | academic |
arxiv_abstracts_gfissore | 1,994 | Towards A Description Of Interactive Psychoinformation Systems.
Preliminary Remarks. (K Opisaniyu Interaktivnyh Psihoinformatsionnyh Sistem.
Predvaritel'Nye Zamechaniya)
An approach to description of interactive psychoinformation systems, based on
the concept of "virtualization" and essentially using the technique o... | 143 | academic |
arxiv_abstracts_gfissore | 1,994 | A New Look at Broken Ergodicity
We study the nature and mechanisms of broken ergodicity (BE) in specific
random walk models corresponding to diffusion on random potential surfaces, in
both one and high dimension. Using both rigorous results and nonrigorous
methods, we confirm several aspects of the standard BE picture... | 176 | academic |
arxiv_abstracts_gfissore | 1,994 | Belavkin-Kolokoltsov Watch-Dog Effects in Interactively Controlled
Stochastic Computer-Graphic Dynamical Systems. A Summary of Mathematical
Researches
This paper contains a summary of mathematical researches of stochastic
properties of the long time behavior of a continuously observed (and
interactively controlled) ... | 85 | academic |
arxiv_abstracts_gfissore | 1,994 | On The Avalanche-finiteness Of Abelian Sandpiles
We prove a necessary and sufficient condition for an Abelian Sandpile Model
(ASM) to be avalanche-finite, namely: all unstable states of the system can be
brought back to stability in finite number of topplings. The method is also
computationally feasible since it invol... | 117 | academic |
arxiv_abstracts_gfissore | 1,994 | Random Walks on a Fluctuating Lattice: A Renormalization Group Approach
Applied in One Dimension
We study the problem of a random walk on a lattice in which bonds connecting
nearest neighbor sites open and close randomly in time, a situation often
encountered in fluctuating media. We present a simple renormalization ... | 132 | academic |
arxiv_abstracts_gfissore | 1,994 | Mass-extinction: Evolution and the effects of external influences on
unfit species
We present a new model for extinction in which species evolve in bursts or
`avalanches', during which they become on average more susceptible to
environmental stresses such as harsh climates and so are more easily rendered
extinct. Res... | 189 | academic |
arxiv_abstracts_gfissore | 1,994 | Kinetic Theory of Anomalous Transport of SupraThermal Particles
The plasma turbulence as is well known plays crucial role in the processes of
plasma dynamics and transport phenomena. It affects both macroscopic plasma
behaviour and distribution of particles, and besides suprathermal component of
particle ensemble is e... | 186 | academic |
arxiv_abstracts_gfissore | 1,994 | Communities of Practice: Performance and Evolution
We present a detailed model of collaboration in communities of practice and
we examine its dynamical consequences for the group as a whole. We establish
the existence of a novel mechanism that allows the community to naturally adapt
to growth, specialization, or chang... | 105 | academic |
arxiv_abstracts_gfissore | 1,994 | The covariance matrix of the potts model: A random cluster analysis
We consider the covariance matrix G^mn(x-y) of the d-dimensional q-states
Potts model, rewriting it in terms of the connectivity, the finite-cluster
connectivity and the infinite-cluster covariance in the random cluster repre-
sentation of Fortuin and... | 393 | academic |
arxiv_abstracts_gfissore | 1,994 | Mapping Self-Organized Criticality onto Criticality
We present a general conceptual framework for self-organized criticality
(SOC), based on the recognition that it is nothing but the expression,
''unfolded'' in a suitable parameter space, of an underlying unstable
dynamical critical point. More precisely, SOC is show... | 167 | academic |
arxiv_abstracts_gfissore | 1,994 | An Evolutionary Approach to Associative Memory in Recurrent Neural
Networks
In this paper, we investigate the associative memory in recurrent neural
networks, based on the model of evolving neural networks proposed by Nolfi,
Miglino and Parisi. Experimentally developed network has highly asymmetric
synaptic weights a... | 97 | academic |
arxiv_abstracts_gfissore | 1,994 | Preferential Partner Selection in an Evolutionary Study of Prisoner's
Dilemma
Partner selection is an important process in many social interactions,
permitting individuals to decrease the risks associated with cooperation. In
large populations, defectors may escape punishment by roving from partner to
partner, but de... | 271 | academic |
arxiv_abstracts_gfissore | 1,995 | Scaling and singularities in the entrainment of globally-coupled
oscillators
The onset of collective behavior in a population of globally coupled
oscillators with randomly distributed frequencies is studied for phase
dynamical models with arbitrary coupling. The population is described by a
Fokker-Planck equation for... | 185 | academic |
arxiv_abstracts_gfissore | 1,995 | Analyzing Social Network Structures in the Iterated Prisoner's Dilemma
with Choice and Refusal
The Iterated Prisoner's Dilemma with Choice and Refusal (IPD/CR) is an
extension of the Iterated Prisoner's Dilemma with evolution that allows players
to choose and to refuse their game partners. From individual behaviors,
... | 160 | academic |
arxiv_abstracts_gfissore | 1,995 | A set of hard spheres with tangential inelastic collision as a model of
granular matter: 1/f^ fluctuation, non-Gaussian distribution, and
convective motion
A set of hard spheres with tangential inelastic collision is found to
reproduce observations of real and numerical granular matter. After time is
scaled so as to... | 143 | academic |
arxiv_abstracts_gfissore | 1,995 | A Pinned Polymer Model of Posture Control
A phenomenological model of human posture control is posited. The dynamics
are modelled as an elastically pinned polymer under the influence of noise. The
model accurately reproduces the two-point correlation functions of experimental
posture data and makes predictions for the... | 85 | academic |
arxiv_abstracts_gfissore | 1,995 | Proportion Regulation in Globally Coupled Nonlinear Systems
As a model of proportion regulation in differentiation process of biological
system, globally coupled activator-inhibitor systems are studied. Formation and
destabilization of one and two cluster state are predicted analytically.
Numerical simulations show th... | 83 | academic |
arxiv_abstracts_gfissore | 1,995 | The Fight Against the Second Law of Thermodynamics
After presenting possible motives for fighting against the second law of
thermodynamics, several attempts to beat this law are analyzed. The second law
wins, but an interesting interpretation of it emerges. This interpretation uses
the notion of ``encoded order'' and ... | 162 | academic |
arxiv_abstracts_gfissore | 1,995 | Upper Bounds for the Critical Car Densities in Traffic Flow Problems
In most models of traffic flow, the car density p is the only free
parameter in determining the average car velocity v . The
critical car density p_c , which is defined to be the car density separating
the jamming phase (with v = 0 ) and the moving p... | 171 | academic |
arxiv_abstracts_gfissore | 1,995 | Statistical Theory of Sedimentation of Disordered Suspensions
An analytical treatment for the sedimentation rate of disordered suspensions
is presented in the context of a resistance problem.
From the calculation it is confirmed that the lubrication effect is important
in contrast to the suggestion by Brady and Durlo... | 98 | academic |
arxiv_abstracts_gfissore | 1,995 | Emergent Traffic Jams
We study a single-lane traffic model that is based on human driving behavior.
The outflow from a traffic jam self-organizes to a critical state of maximum
throughput. Small perturbations of the outflow far downstream create emergent
traffic jams with a power law distribution P(t) t^-3/2 of lifeti... | 164 | academic |
arxiv_abstracts_gfissore | 1,995 | Traffic at the Edge of Chaos
We use a very simple description of human driving behavior to simulate
traffic. The regime of maximum vehicle flow in a closed system shows
near-critical behavior, and as a result a sharp decrease of the predictability
of travel time. Since Advanced Traffic Management Systems (ATMSs) tend ... | 123 | academic |
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